A multifunctional wrist watch combining the functions of time-indication with other functions, for example a calculator. The watch has a glass in which pick-ups are provided for detecting the passage of a finger of a user over the surface of the glass and recognition circuits for converting the trace...http://www.google.fr/patents/US4047010?utm_source=gb-gplus-shareBrevet US4047010 - Multi-functional electronic watch
